<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
	request.setAttribute("uid", "admin");
	session.setAttribute("uid", "hanlu");
	
	Integer count = (Integer)application.getAttribute("count");
	if(count == null){
		application.setAttribute("count", 1);
	}else{
		application.setAttribute("count", count+1);
	}
	

 %>
 <!--page request session application  -->
 ${uid }<br/>
 ${sessionScope.uid }<br/>
 ${applicationScope.count}<br/>
</body>
</html>